Pipe coupling



FIG. 1 is a side elevation view of a pipe coupling incorporating our new design. The opposite side of the coupling is a mirror image of that shown in FIG. 1;

FIG. 2 is a top plan view of the pipe coupling illustrated in FIG. 1;

FIG. 3 is a bottom plan view of the pipe coupling illustrated in FIGS. 1 and 2;

FIG. 4 is an end elevation view of the pipe coupling; and,

FIG. 5 is a perspective view of the pipe coupling. 

The ornamental design for a pipe coupling, as shown and described. 